8 Science - SCA 1B

Earth's Interior

100

What causes heat in the Earth's core that makes convection currents possible?

Radioactive Decay

200

If a rocks density increases it would move...

Toward the lower mantle

300

If we are talking about density of materials inside the Earth, what topic are we discussing?

Planetary Differentiation

400

If you put the following materials in a beaker with water and Layer 4 is at the bottom of the beaker, which would be in Layer 2?

A - 2.3 g/cm³

B - 2.9 g/cm³

C - 1.4 g/cm³

D - 1.3 g/cm³

C - 1.4 g/cm³

500

What happens to rock once it reaches the upper mantle?

Its temperature goes down and its density increases.

Earthquakes and Seismic Waves

100

S-Waves are unable to move through what type of material?

Liquids

200

When an earthquake occurs, the seismograph stations ______ to the epicenter will be the first to detect it.

Closest

300

If no S-waves are detected between 2,900 km deep and 5,200 km deep, what must that layer of the Earth be?

Liquid

400

If a graph showing the speed of P-waves suddenly changes, what does it indicate happened to the P-Waves?

They entered a new layer of the Earth

500

If an earthquake occured at South Pole, which station would record the fewest seismic waves?

A - A station on the southern tip of South America

B - A station in northern Canada

C - A station in the middle of Australia

B - A station in northern Canada

Landforms and Plates

100

What caused the Hawaiian Islands to form?

Hot spot

200

Volcanoes are usually found...

Along tectonic plate boundaries

300

If a plate is destroyed by subduction, that means it went _________ another plate.

Under

400

In a rift valley, the tectonic plates are moving ________ from each other.

Away

500

Explain to me how studying the age of sediment in ocean basins helps to understand sea-floor spreading. 

The newest material is found near mid-ocean ridges and it gets older the further you go from them.

Catch All

100

Which of these materials is the least dense?

A - 99.0 g/cm³

B - 97.6 g/cm³

C - 97.7 g/cm³

B - 97.6 g/cm³

200

Undersea earthquakes can also lead to what phenomena that is a big wave.

Tsunami

300

Convection currents occur in what layer of the Earth?

Mantle

400

Rock sinks to the lower mantle because its density...

Increased

500

What process forms mid-ocean ridges?

Oceanic crust separating and letting mantle material through to the surface